Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
1,705 institutional managers reported holding AMT for the quarter ended Mar 31, 2026. Together they hold about 89% of shares outstanding; the top 10 hold 43%. 147 opened new positions; 188 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 63.02M | 13.50% | $10.88B | trimmed -1.2% | ≤2013 |
| BlackRock | 44.95M | 9.63% | $7.76B | added +2.1% | ≤2013 |
| State Street | 21.43M | 4.59% | $3.70B | added +2.1% | ≤2013 |
| Geode Capital | 13.93M | 2.98% | $2.41B | added +3.2% | ≤2013 |
| Cohen & Steers | 12.62M | 2.70% | $2.18B | added +1.1% | ≤2013 |
| FMR (Fidelity) | 11.32M | 2.42% | $1.95B | trimmed -5.8% | ≤2013 |
| Morgan Stanley | 9.58M | 2.05% | $1.65B | trimmed -2.3% | ≤2013 |
| UBS | 7.83M | 1.68% | $1.35B | trimmed -2% | ≤2013 |
| Deutsche Bank AG\ | 7.77M | 1.66% | $1.34B | added +12.4% | 2013 Q3 |
| Lazard Asset Management LLC | 7.33M | 1.57% | $1.26B | added +20.4% | ≤2013 |
| Invesco | 7.28M | 1.56% | $1.26B | added +4.7% | ≤2013 |
| Principal Financial Group INC | 5.93M | 1.27% | $1.02B | trimmed -2% | ≤2013 |
| Dimensional Fund Advisors | 5.81M | 1.25% | $1.00B | trimmed -7.5% | ≤2013 |
| Capital Group (American Funds) | 5.67M | 1.21% | $978.4M | added +34.3% | ≤2013 |
| Northern Trust | 5.34M | 1.14% | $921.7M | unchanged | ≤2013 |
| Charles Schwab Investment Management | 5.24M | 1.12% | $904.6M | added +2.7% | ≤2013 |
| Legal & General Group PLC | 4.83M | 1.03% | $833.1M | trimmed -1% | ≤2013 |
| T. Rowe Price | 4.77M | 1.02% | $824.1M | trimmed -15.8% | ≤2013 |
| Goldman Sachs | 4.70M | 1.01% | $810.9M | added +21.7% | ≤2013 |
| Bank OF America CORP /DE/ | 4.51M | 0.97% | $778.8M | added +14.4% | ≤2013 |
| Arrowstreet Capital | 4.20M | 0.90% | $724.3M | trimmed -1.7% | 2024 Q1 |
| Capital Research Global Investors | 4.10M | 0.88% | $708.3M | added +4.6% | 2018 Q2 |
| Nuveen | 3.89M | 0.83% | $671.4M | trimmed -2.1% | ≤2013 |
| Amundi | 3.83M | 0.82% | $661.2M | added +21% | 2017 Q4 |
| Clearbridge Investments, LLC | 3.69M | 0.79% | $636.2M | added +13.9% | ≤2013 |
| Wells Fargo & COMPANY/MN | 3.50M | 0.75% | $604.5M | added +16.3% | ≤2013 |
| Franklin Resources | 3.34M | 0.72% | $577.2M | trimmed -37.4% | ≤2013 |
| Ameriprise Financial INC | 3.31M | 0.71% | $571.5M | trimmed -18.1% | ≤2013 |
| BNY Mellon | 2.77M | 0.59% | $478.8M | added +2.1% | ≤2013 |
| Federated Hermes, INC. | 2.76M | 0.59% | $475.8M | added +365.8% | ≤2013 |
| CPP Investment Board | 2.39M | 0.51% | $412.0M | added +8.6% | ≤2013 |
| Manufacturers Life Insurance Company, THE | 2.32M | 0.50% | $399.8M | trimmed -7.6% | ≤2013 |
| Nordea Investment Management AB | 2.04M | 0.44% | $353.0M | added +17.3% | 2018 Q3 |
| BNP Paribas Financial Markets | 2.00M | 0.43% | $345.5M | trimmed -3.1% | ≤2013 |
| Fisher Investments | 1.74M | 0.37% | $299.7M | trimmed -2.4% | 2020 Q2 |
| Royal Bank OF Canada | 1.65M | 0.35% | $284.0M | added +12.3% | ≤2013 |
| Cantillon Capital Management LLC (focused) | 1.61M | 0.34% | $278.3M | trimmed -11.9% | 2016 Q1 |
| Barrow Hanley Mewhinney & Strauss LLC | 1.59M | 0.34% | $273.7M | added +10.5% | 2025 Q3 |
| Mitsubishi UFJ Asset Management CO., LTD. | 1.58M | 0.34% | $272.6M | added +3% | ≤2013 |
| Hsbc Holdings PLC | 1.57M | 0.34% | $271.5M | trimmed -8.2% | ≤2013 |
| Raymond James Financial INC | 1.55M | 0.33% | $267.8M | added +54.5% | ≤2013 |
| National Pension Service | 1.53M | 0.33% | $264.7M | trimmed -0.9% | 2014 Q3 |
| Magellan Asset Management | 1.50M | 0.32% | $259.5M | added +40.3% | 2014 Q2 |
| SG Americas Securities, LLC | 1.38M | 0.30% | $238.7M | added +24.4% | ≤2013 |
| Swiss National Bank | 1.37M | 0.29% | $237.2M | added +7.1% | ≤2013 |
| Cibc Bancorp USA INC. | 1.36M | 0.29% | $234.5M | trimmed -11.8% | 2014 Q1 |
| American Century Companies INC | 1.35M | 0.29% | $232.9M | trimmed -31.4% | ≤2013 |
| Mirae Asset Global Etfs Holdings LTD. | 1.27M | 0.27% | $219.4M | added +72.1% | ≤2013 |
| Barclays PLC | 1.26M | 0.27% | $216.8M | trimmed -13.7% | ≤2013 |
| Two Sigma | 1.23M | 0.26% | $211.8M | added +0.9% | 2023 Q1 |
Largest 50 of 1,705 shown; the full ranked, searchable register is at boothcheck.com/holders/AMT. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.